Year	Hours per Week
2001-01-01	40.4
2002-01-01	42.4
2003-01-01	37.5
2004-01-01	35.8
2005-01-01	34.4
2006-01-01	37.7
2007-01-01	38.4
2008-01-01	37.5
2009-01-01	37.3
2010-01-01	39.0
2011-01-01	38.5
2012-01-01	38.4